In pictures: Cenotes of Mexico

The Cenotes (literally meaning sinkholes) of the Yucatan peninsula (located just south of Cancun, Mexico) are extremely popular with visitors, swimmers, snorkelers and divers. The entire Yucatan peninsula was once a reef beneath the ocean until the water receded, causing the sea life to be fossilised into the walls of deep holes thus forming a subterranean universe of caverns…